GMPartsGiant.com offers the wholesale prices for genuine 2005 Chevrolet Avalanche 1500 2WD parts. Parts like Engine Assembly-Oil Pump, Oil Pan & Related Parts are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 5.3L, 8 Cyl 5.3L Flex. Model Code: 1/2 TON.